Xash3D FWGS engine
Python MUD/MUX/MUSH/MU* development system
A tool to easily transform Unreal Engine games into VR experiences
Full featured MUD server with all the trimmings.
Tools and Z80 engine for creating adventure games. (RUST)
RPG dice roll simulator for vintage Tandy TRS-80 100/102/200 laptops
An online multiplayer turn based strategy game and board game engine.
Open Source 3D Game Engine